Cumulative update KB5003214 fails to install

Jauhar I have tried to upgrade Windows 10 using the media creation tool and it fix the same problem that you have mentioned. I have the same problem before installing KB5001330 and a lot of Cumulative Updates. Just select Upgrade This PC and make sure to select Keep Files and Apps to make sure that you still have the apps/files that you have before upgrading. For me, it takes about 1 hour from the Media Creation Tool up to a couple of restarts. But it depends on your internet speed. And now I can install all updates. Also tried SFC and DISM Scans but did not fix my problem.  Upgrading your PC will replace your Windows Files, but not affects Files, Apps, and Drivers. After that, there will be some updates in the Windows Updates after the upgrade.

Optional:

Delete the ESD Folder in the C:/ directory

Settings/System/Storage/Temporary Files then scan our Temporary Files and delete the Previous Installation of Windows. (Deletes the Windows.old folder)

*Doing Optional things will make your drive space bigger as it deletes the files used in the upgrade, but its files will be needed if you have problems, to go back to the previous install/state.

Also, I tried it with my another PC, with an AMD A8 CPU that takes about 1 and a half hour for the upgrade process and it also fix the problem. Hope that works.